JP2002152277A - Mobile network and transfer method for ip packet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile network that can attain data communication with assured QoS in terms of END-END, even when a terminal is moved to an external network and allows the terminal to receive an IP packet from IP nodes. SOLUTION: Upon the receipt of an IP packet addressed to a moved terminal, an encapsulated IP packet to transfer the IP packet is generated, and the encapsulated IP packet is transferred to a mobile destination via a path set, in response to its QoS class. The IP packet is extracted from the encapsulated IP packet received from a 1st IP node, to which the moved terminal is usually connected and transmitted to the terminal. The mobile network has a 2nd IP node, to which the terminal is connected at its moving destination, the moved terminal informs the 1st IP node about the moving destination and also about the QoS information that is used to set the QoS class of the encapsulated IP packet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a mobile network which enables a mobile terminal to communicate via a destination network.

[0002]

2. Description of the Related Art In data communication by an information processing device such as a personal computer, IP packet communication is currently widely used. In the IP packet communication, an IP address is assigned to each terminal according to a network to which a normal connection is made. Therefore, when a terminal moves and performs data communication via a destination network, it is necessary to reassign an IP address corresponding to the network. However, when the terminal moves, the IP address of the terminal changes. If this is the case, other terminals will not be able to identify the terminal that has moved.

Therefore, as a technology for enabling data communication without changing an IP address assigned to a terminal even when the terminal moves to a different network, for example, the IETF (Internet Engineering Task Force)
) Mobile I, which is recommended in RFC 2002 and transfers IP packets to a destination by encapsulating IP packets.
P technology is known.

[0004] Encapsulation is a technique for transferring a certain IP packet using another IP packet in order to transfer the IP packet. The encapsulation method includes, for example, IP in IP E recommended in IETF RFC2003.
A method called ncapsulation, a method called Minimal Encapsulation within IP recommended in RFC 2004, and a Generic Routing Enca recommended in RFC 1701
There is a method called psulation. For example, RFC 20
In the IP in IP Encapsulation 03, in order to transfer a certain IP packet, the IP packet is inserted into another IP packet and transferred.

FIG. 6 is a block diagram showing a configuration of a mobile network using the conventional Mobile IP technology.

The mobile network shown in FIG. 6 includes a fixed terminal 102, a mobile terminal 112 which is a mobile information processing device such as a notebook personal computer or a mobile phone, and an HA (Home Agent) for managing the IP address of the mobile terminal 112. )
FA (Foreign Agent) devices 302 and 3 for managing communication between the device 202 and the mobile terminal 112 at the destination.
12 is provided. The HA device 202 and the FA devices 302 and 312 shown in FIG. 6 are each called an “IP node”.

[0007] The fixed terminal 102 is an information processing device such as a personal computer used at a fixed position.
The device 202 and the FA devices 302 and 312 are information processing devices such as server devices, respectively.

[0008] The Home Network 412 is connected to the Mobile terminal 112.
Is an Ethernet, wireless LAN, mobile communication network, or the like to which normal connection is established, and is an access network to the IP Network 402. In addition, Foreign Network 422, 432
Ethernet and wireless LA to which the ile terminal 112 connects at the destination
N or a mobile communication network, etc.
Is an access network for

An IP packet A addressed to the mobile terminal 112 transmitted from the fixed terminal 102 is encapsulated by the HA device 202 and transferred via the IP Network 402 to, for example, the FA device 302 to which the mobile terminal 112 is currently connected. Is done. Note that the encapsulated IP packet A
Is referred to as an IP packet B here. FA device 302
An IP packet A is extracted from the P packet B and transmitted to the mobile terminal 112.

[0010] The HA device 202 is a binding, which is information for transferring the encapsulated IP packet to the FA device.
A binding table 212 that holds a list is provided. B
The inding list includes information such as an IP address called Care-of Address used when the mobile terminal 112 is connected to the FA device, and an expiration date of the binding list.

Normally, information held as a binding list is valid only within a predetermined period,
Transmits the information for rewriting the binding list to the HA device 202 immediately when the connection destination is changed from the FA device 302 to the FA device 312, and periodically even when the connection destination FA device is not changed. I do.

[0012]

The above-mentioned conventional mobile network has the following problems.

For example, when a plurality of packets having different priorities are transmitted from an arbitrary fixed terminal to a mobile terminal connected to an FA device, conventionally, a QoS (Qualical Qualification) is added to a Binding list.
Since no ity of service information is registered, both low-priority IP packets and high-priority IP packets are encapsulated in the same process, and are transferred from the HA device to the FA device in the same QoS class.

In a conventional mobile network,
As shown in FIG. 7, since only one transfer destination is registered in the Binding table for each Home Address, which is an IP address assigned to the Mobile terminal, the transfer destination of the encapsulated packet is one. It will be limited. Therefore, for example, when a mobile communication network is constructed as a Foreign Network, the mobile terminal cannot receive IP packets from a plurality of FA devices at the same time, so that a soft handover process or the like cannot be performed. was there.

[0015] The present invention has been made to solve the above-mentioned problems of the conventional technology, and is provided with an end-E even when a terminal is moving to an external network.
It is an object of the present invention to provide a mobile network that enables data communication with QoS guaranteed by nd and that enables a terminal to receive IP packets from a plurality of IP nodes.

[0016]

In order to achieve the above object, a mobile network according to the present invention is a mobile network which enables communication between a plurality of terminals, and receives an IP packet addressed to a moved terminal. Generating an encapsulated IP packet for transferring the IP packet to the destination of the terminal;
A first IP node to which the terminal normally connects, which is transferred to a destination of the terminal via a path set according to an S class, and the IP from the encapsulated IP packet received from the first IP node. A second IP that extracts and transmits a packet to the terminal, to which the terminal connects at a destination
And a terminal that has moved, and notifies the first IP node of a destination and a QoS information for setting a QoS class of the encapsulated IP packet.

At this time, the terminal may notify the destination and the QoS information to the first IP node using a control packet for location registration, and
The node may store the destination information and the QoS information in a table format.

Further, the first IP node may set a predetermined expiration date for the destination information and the QoS information, and rewrite the information when the terminal moves and at predetermined time intervals.

[0019] Further, the first IP node may include the I
When there are a plurality of transfer destinations of the P packet, the encapsulated IP packet may be generated by the number of the transfer destinations and transmitted to each transfer destination.

Another mobile network according to the present invention is a mobile network which enables communication between a plurality of terminals, and receives a first IP packet addressed to a first terminal that has moved and receives the first IP packet. A second IP packet in which the IP address indicating the destination of the IP packet of the first terminal is rewritten to the IP address of the destination of the first terminal, and the second IP packet is set to a path set according to its QoS class Via an IP node to which the first terminal normally connects, to the destination of the first terminal, and the first terminal has transmitted the IP node or the first IP packet. This is a configuration in which at least one of the second terminals is notified of a destination and QoS information for setting a QoS class of the second IP packet is notified.

At this time, the first terminal may notify the IP node and the second terminal of the destination and the QoS information of the first terminal using a control packet for location registration. Preferably, the IP node and the second terminal may store destination information of the first terminal and the QoS information in a table format.

Further, the IP node and the second terminal set a predetermined expiration date in the destination of the first terminal and the QoS information, and when the first terminal moves,
And may be rewritten at predetermined time intervals.

[0023] Further, the IP node comprises a first I
When there are a plurality of P packet transfer destinations, the second IP
Packets may be generated for the number of destinations and transmitted to each destination.

When the second terminal is notified of the destination of the first terminal and the QoS information from the first terminal, the second terminal transmits a first IP packet addressed to the first terminal. The IP address indicating the destination is set to the IP address of the destination of the first terminal.
A second IP packet rewritten with an address may be generated, and the second IP packet may be directly transmitted to a destination of the first terminal via a path set according to the QoS class. When there are a plurality of paths, the second terminal may copy the second IP packet by the number of paths and transmit the duplicated IP packet to the first terminal via each path.

On the other hand, an IP packet transfer method of the present invention is an IP packet transfer method for enabling communication between a plurality of terminals via a mobile network,
The first IP node to which the terminal normally connected receives the IP packet addressed to the moved terminal, generates an encapsulated IP packet for transferring the IP packet to a destination of the terminal, and generates the encapsulated IP packet. Packets whose QoS
The terminal transfers the packet to a second IP node connected at the destination via a path set according to the class, extracts an IP packet addressed to the moved terminal, and transmits the extracted IP packet to the terminal from the second IP node. A method of notifying a first IP node of a moved terminal to a destination of the terminal and QoS information for setting a QoS class of the encapsulated IP packet.

At this time, information on the destination of the terminal and the QoS information may be notified from the terminal to the first IP node using a control packet for location registration, and the destination of the terminal may be notified. Information and the QoS information may be stored in a table format by the first IP node.

Further, information on the destination of the terminal and the Q
A predetermined expiration date may be set in the oS information, and the information may be rewritten when the terminal moves and every predetermined time.

Further, when there are a plurality of transfer destinations for the IP packet, the first IP node
P packets may be generated for the number of destinations and transmitted to each destination.

Another method of transferring an IP packet according to the present invention is a method of transferring an IP packet for enabling communication between a plurality of terminals via a mobile network, the method being directed to a first terminal that has moved. Receiving the first IP packet and rewriting the IP address indicating the destination of the first IP packet to the destination IP address of the first terminal at the IP node to which the first terminal normally connects To generate a second IP packet, and transfer the second IP packet to the first IP packet through a path set according to the QoS class.
The first terminal notifies the IP node or at least one of the second terminals that transmitted the first IP packet of the destination of the first terminal. And a method of notifying QoS information for setting a QoS class of the second IP packet.

At this time, the information of the destination of the first terminal and the QoS information may be notified from the first terminal to the IP node and the second terminal by using a control packet for location registration. Preferably, the destination information and the QoS information of the first terminal may be stored in a table format by the IP node and the second terminal.

Also, a predetermined expiration date may be set in the information on the destination of the first terminal and the QoS information, and the information may be rewritten when the first terminal moves and every predetermined time.

Further, when there are a plurality of transfer destinations of the IP packet, the second IP packet may be generated by the IP node by the number of transfer destinations and transmitted to each transfer destination.

When the first terminal moves, the first IP transmitted by the second terminal to the first terminal is transmitted.
A second IP packet is generated by rewriting an IP address indicating a packet transmission destination to a destination IP address, and the first terminal is transmitted through the path set according to the QoS class of the first terminal. May be directly transmitted to the destination, and when there are a plurality of paths, the second IP packet is duplicated by the number of paths, and the second terminal is copied from the second terminal via each path to the first IP packet. It may be transmitted to the terminal.

(Operation) In the mobile network and the IP packet transfer method as described above, the destination and the QoS information are notified from the moved terminal to the IP node to which the terminal normally connects, and the encapsulated IP address is transmitted from the IP node. Since the packet or the IP packet after the change of the IP address is transferred to the destination of the terminal via a path according to the QoS class, a mobile network capable of performing end-to-end QoS guaranteed data communication is realized.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

(First Embodiment) In this embodiment, I
A mobile network that performs communication according to the Mobile IPv4 protocol recommended by ETF RFC2002 will be described as an example.

FIG. 1 is a block diagram showing the configuration of the mobile network according to the first embodiment of the present invention.

As shown in FIG. 1, the mobile network according to the first embodiment includes a fixed terminal 100 and a mobile information processing device such as a notebook computer or a mobile phone.
bile terminal 110, an HA (Home Agent) device 200 that receives an IP packet addressed to the mobile terminal 110, encapsulates and transfers the received IP packet, and converts an IP packet addressed to the mobile terminal 110 from the encapsulated IP packet. FA (Foreign Agent) devices 300 and 3 to be extracted
10 is provided. The HA device 200 and the FA devices 300 and 310 shown in FIG. 1 are each called an “IP node”.

The fixed terminal 100 is an information processing device such as a personal computer used at a fixed position,
The device 200 and the FA devices 300 and 310 are information processing devices such as server devices, respectively. In addition, the fixed terminal 10
0, the HA device 200 and the FA devices 300 and 310 include a processing device (not shown) that executes each process described below,
And a storage device for storing predetermined data.

The Home Network 410 is a mobile terminal 110
Is an normally connected Ethernet, wireless LAN, mobile communication network, or the like, and is an access network to the IP Network 400. Also, Foreign Network 420, 430
Is an Ethernet, a wireless LAN, a mobile communication network, or the like to which the Mobile terminal 110 connects at the destination, and the IP Network
400 is an access network.

Each of the fixed terminal 100 and the mobile terminal 110 has a home address I called by the HA device 200.
A P address is assigned. The fixed terminal 100 and the mobile terminal 110 are uniquely specified on the IP Network by the Home Address. Further, an IP address called a Care-of Address is assigned to each of the FA devices 300 and 310. The FA device uses this Care-of Address to
Uniquely specified on twork. The Care-of Address is managed by the FA device. For example, when the Mobile terminal 110 is connected to the FA device 300, the Mobile terminal 110 is notified of the Care-of Address from at least one FA device 300.

The Care-of Address is written in the Source Address area (source address) or Destination Address area (destination address) of the header of the IP packet. Note that, in the case of the Mobile IPv4 protocol, the IP packet may be generated in a configuration specified in RFC791.

Mobile terminal 1 moved to Foreign Network
From 10 the Care-of notified by the destination FA device
The address is transmitted to the HA device 200. HA device 20
0 manages the Home Address and the Care-of Address for each mobile terminal, and the management data is stored in the storage device of the HA device 200 in the binding table 210. FIG. 2 shows a configuration example of the binding table 210.

FIG. 2 shows the Bind provided in the HA device shown in FIG.
It is a schematic diagram which shows an example of a structure of an ing table.

As shown in FIG. 2, the binding table 21
0 is prepared in units of Home Address of each mobile terminal. Further, the received IP address is stored in the Binding table 210.
The QoS class used in the encapsulated packet and the Care-of Address are registered in association with each QoS class unit of the packet. Note that the Care-of Address may be different for each QoS class, and a plurality of Care-of Addresses may be registered.
The information registered in the binding table 210 is updated when the mobile terminal 110 notifies the HA device 200 using a control packet.

The HA device 200 has a binding table 21
0 that arrives at the mobile terminal 110 using the information of
The mobile terminal 110 encapsulates the packet and transfers the encapsulated IP packet (encapsulated packet) to the currently connected FA device. For encapsulation of IP packets, for example, IETF RFC2003, IETF
There is a method recommended in RFC 2004, IETF RFC 1701, and the like.

Upon receiving the encapsulated packet addressed to the mobile terminal connected to itself, FA apparatus 300 and FA apparatus 310 extract an IP packet addressed to the mobile terminal from the encapsulated packet and transmit it to the corresponding mobile terminal. I do.

Next, the operation of each device in the mobile network of this embodiment will be described.

First, the flow of a packet on the mobile network in this embodiment will be described.

In FIG. 1, when fixed terminal 100 transmits IP packet A to mobile terminal 110, IP packet A is received by HA device 200 via IP Network 400. HA device 200 receives IP packet A
Destination Address (Home Addre
ss) and the corresponding Binding
The table 210 is specified.

Subsequently, the HA device 200 uses the TOS information of the IP packet A as the QoS class information, and specifies the QoS class and the Care-of Address of the encapsulated packet. For example, when the binding table 210 is set as shown in FIG. 2, if the QoS class of the IP packet A is A, the QoS class of the encapsulated packet is A, and the transfer destination is the FA device 300. Similarly, the QoS class of the encapsulated packet corresponding to the QoS class B IP packet is A, and the transfer destination is F
A device 300.

After performing the above processing, the HA device 200 generates an encapsulated IP packet A ′ from the IP packet A.

Next, the HA device 200
The P packet A ′ is transmitted to the IP network 400. The IP packet A 'is sent to the FA device 300 via the IP network 400.
Is forwarded to At this time, each IP node constituting the IP Network 400 transfers the IP packet A ′ to the FA device 300 while performing priority processing according to the QoS class.

The FA device 300 extracts the IP packet A addressed to the mobile terminal 110 from the received IP packet A ′, and transmits it to the mobile terminal 100.

As described above, 1 is transferred from the HA device 200 to the FA device 300 via the IP Network 400.
One or more encapsulated packets are
On the 400, priority processing is performed for each QoS class and the data is transferred.

Next, from the mobile terminal 110 to the HA device 20
The procedure of the position registration process performed on 0 will be described.

The mobile terminal 110 is connected to the home network 410
Leaves and connects to Foreign Network 420, IET
F. Obtain a Care-of Address from the FA device 300 according to the Mobile IP protocol specified in RFC2002.

Next, the Mobile terminal 110 transmits the acquired Care
-of Address is transmitted to the HA device 200. HA device 2
00 indicates the received Care-of Address in the binding table 21
Register to 0. Registration of IP packet transfer destinations based on information from such a mobile terminal
This is called processing (defined in RFC2002).

When the connection destination is changed from the FA device 300 to the FA device 310 due to the movement of the Mobile terminal 110, the Mobile terminal 110 receives the Care-o from the FA device 310.
f Address is acquired, the acquired Care-of Address is transmitted to the HA device 200, and is registered in the Binding table 210.

Since the information registered in the binding table 210 has an expiration date, the mobile terminal 110 updates the registration data in the binding table 210 at predetermined time intervals regardless of whether the connection destination is changed (Binding Update).
processing).

The mobile terminal 110 connected to the mobile network of the present embodiment uses the control packet for the registration process and the control packet for the binding update process to transmit the QoS information for setting the QoS class of the encapsulated packet to the HA. Transmit to the device 200. HA device 20
0 sets the contents of the Binding table 210 based on the QoS information transmitted from the Mobile terminal 110. In addition,
The QoS information includes, for example, Diff-serv (Differentiated
Services (TOS) (Type of Se
rvice) information.

Here, as shown in FIG.
When the ork 420 and Foreign Network 430 are mobile communication networks and the mobile terminal 110 is in a soft handover state, the mobile terminal 110 accesses both the FA device 300 and the FA device 310. In such cases, Mobile
The terminal 110 registers both the FA device 300 and the FA device 310 in the binding table 210 as the transfer destination of the IP packet.

As described above, the binding table 210
Can change the registration of the forwarding destination for each QoS class.
For example, as shown in FIG. 4, a setting is made so that some of the encapsulated packets of the QoS class can be transferred to both the FA device 300 and the FA device 310, and the encapsulated packets of the other QoS classes are transferred only to the FA device 300. It is also possible to set to perform.

It is also conceivable that Foreign Network 420 is a LAN and Foreign Network 430 is a mobile communication network. Also in this case, the mobile terminal 110
Different FA device for each class Binding table 200
Can be registered at Furthermore, when the mobile terminal 110 has three or more
When connected to a Foreign Network, three or more destinations can be registered.

When a plurality of transfer destinations are registered in this way, the HA device 200 generates encapsulated packets by the number of transfer destinations and transfers the packets to each of the transfer destinations. For example, in the example shown in FIG.
00, the packet is encapsulated into two packets, and transferred as IP packet A ′ and IP packet A ″ to the FA devices 300 and 310 via different paths.

QoS Registered in Binding Table 210
There are various types of classes. For example, there are a bandwidth guarantee type, a delay priority type, a best effort type, and a type with retransmission control. When the setting contents of the binding table 200 are rewritten by the control packet transmitted from the mobile terminal 110 and a new FA device is registered as a transfer destination of the encapsulated packet, the HA device 200
Sets a new path with the FA device for each QoS class.

As described above, the mobile terminal 110
Data communication is performed using a control packet for location registration such as a registration process or a binding update process while specifying an FA device to be transferred according to the QoS class.

Therefore, according to the mobile network in the present embodiment, the HA terminal 200 generates an encapsulated packet for each QoS class according to the information in the binding table 210.
End-En, even when connected to ign Network
Data communication with QoS guaranteed by d becomes possible.

Further, since a plurality of FA devices can be set as transfer destinations of the IP packet, it becomes possible to transfer the IP packet addressed to the mobile terminal from the HA device 200 to the plurality of FA devices. Therefore, since the mobile terminal 110 can receive the IP packet in the soft handover state,
IP packets can be received reliably.

Further, when the required communication quality is different and the foreign networks satisfying the quality are different, the FA device on the different foreign network is registered as a transfer destination for each QoS class, so that the QoS guaranteed data communication can be performed. Will be possible.

(Second Embodiment) The first embodiment is
A mobile network that communicates according to the Mobile IPv4 protocol was assumed. In the present embodiment, Mobile
A mobile network that performs communication according to the IPv6 protocol will be described as an example.

In the Mobile IPv6 protocol, as a Care-of Address used by a mobile terminal, a Collocated Care-o
An IP address called f Address is used. This C
ollocated Care-of Address is Mobi for each Foreign Network
le Assigned in terminal units. Collocated Care-of Add
The “ress” is registered in the storage device of the HA device together with the Home Address as in the first embodiment, and is managed as a Binding list by a Binding table. Also, Mobile IPv6
In the protocol, since each terminal can be uniquely specified by the collocated care-of address, an FA device is unnecessary.

Further, in the Mobile IPv6 protocol, a fixed terminal or a node terminating in the Mobile IPv6 protocol can have a table (Binding table) for managing a Binding list. In this case, a fixed terminal or a node terminating in the Mobile IPv6 protocol and a mobile terminal are connected to the HA device except for a period from the start of communication until a binding list is generated in the fixed terminal or a node terminating in the Mobile IPv6 protocol. It is possible to communicate directly without going through.

FIG. 5 is a block diagram showing the configuration of the mobile network according to the second embodiment of the present invention.

The mobile network shown in FIG.
The difference from the mobile network of the first embodiment shown in FIG. 1 is that there is no device. In addition, the fixed terminal 101
Is also a configuration that can include a Binding table 221. Further, the Home Network, Foreign Network, and IP nodes are all configured with devices that support the IPv6 protocol.

Bind provided in HA device and fixed terminal 101
The configuration of the ing table 221 is the same as in the first embodiment. However, the forwarding destination of the binding table 221 is FA
A Collocated Care-of Address is registered instead of the device. Also, a plurality of Collocated Care-of Addresses of the transfer destination can be registered.

Next, the operation of the mobile network according to the present embodiment will be described.

The mobile terminal 111 is connected to the home network 411
, The registration process is performed on the HA device 201 when the HA device 201 is connected to the Foreign Network 421. Also, Mobi
le terminal 111 is Foreign Network from Foreign Network 421
When the connection destination is changed to the work 431, a Binding Update process is performed. Further, as in the first embodiment, the mobile terminal 111 transmits a control packet for registration processing or a binding packet.
g Register QoS information using the control packet of the update process.

Fixed terminal 101 transmits IP packet A to Mobile
When transmitted to the terminal 111, the IP packet A
The data is transferred to the HA device 201 via the work 401. HA
The device 201 determines the Destinatio of the received IP packet A.
Using the n Address, specify the Collocated Care-of Address of the mobile terminal 111 from the binding table 211,
Of the IP packet A based on the Collocated Care-of Address
The IP address B is generated by rewriting the Destination Address. Further, the HA device 201 sets a path for each QoS class with the mobile terminal 111 of the movement destination.

The IP packet B transmitted from the HA device 201 to the IP network 401 is transferred to the mobile terminal 111 via the path set by the HA device 201.

The mobile terminal 111 is connected to the fixed terminal 101
When communicating with the fixed terminal 101,
Performs Binding Update processing for. That is, the binding list of the mobile terminal 111 is registered in the binding table 221 managed by the fixed terminal 101 for each QoS class.

The fixed terminal 101 is the Bi of the mobile terminal 111.
After registering the nding list and QoS information, the next I
Col registered in the Binding table 221 from the P packet
It transmits to the mobile terminal 111 using the located Care-of Address.

Referring to FIG. 5, the IP packet C
Is transmitted directly from the fixed terminal 101 to the mobile terminal 111. The QoS class of IP packet C is Binding
The QoS class registered in the table 221 is used.

Incidentally, the transfer destination of the binding table 221 includes a plurality of collocated care-ofs as in the first embodiment.
Address can be registered. In that case, HA
The device or the fixed terminal 101 is the mobile terminal 1 of the movement destination.
11 and a path for each QoS class is set, and the IP packets C are duplicated by the set number of paths, and the duplicated IP packets C are transmitted via the plurality of paths. Therefore, also in the mobile network according to the present embodiment, since the mobile terminal 111 can receive the IP packet in the soft handover state as in the first embodiment, it is possible to reliably receive the IP packet.

As described above, the mobile network according to the present embodiment also has an End-
Data communication with QoS guaranteed by End becomes possible.

[0086]

Since the present invention is configured as described above, the following effects can be obtained.

The terminal which the terminal normally connects from the moved terminal
The destination and QoS information are notified to the P node, and the encapsulated IP packet or the IP packet after the IP address is changed is transferred from the IP node to the destination of the terminal via the path according to the QoS class. Q at -End
A mobile network capable of performing data communication with oS guarantee is realized.

Further, since a plurality of IP nodes can be registered as transfer destinations of the IP packet, for example, when the terminal is a mobile terminal, it becomes possible to receive the IP packet in a soft handover state, and the terminal can receive the packet reliably. .

Further, even when the communication quality differs depending on the QoS class and the foreign networks satisfying the quality are different, the IP nodes on the different foreign networks are
By setting as a transfer destination in oS class units, Q
oS-guaranteed communication becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile network according to a first exemplary embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration example of a binding table provided in the HA device illustrated in FIG. 1;

FIG. 3 is a block diagram showing another configuration of the mobile network according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a configuration example of a binding table provided in the HA device illustrated in FIG. 3;

FIG. 5 is a block diagram showing a configuration of a mobile network according to a second exemplary embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a mobile network using the conventional Mobile IP technology.

FIG. 7 shows the H of the conventional mobile network shown in FIG.
FIG. 3 is a schematic diagram illustrating a configuration of a binding table provided in the device A.

[Explanation of symbols]

 100, 101 Fixed terminal 110, 111 Mobile terminal 200, 201 HA device 210, 211, 221 Binding table 300, 310 FA device 400, 401 IP Network 410, 411 Home Network 420, 430, 421, 431 Foreign Network

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA10 HA08 HC14 HD06 HD09 JT02 JT09 KA05 LD11 LD18 MD09 5K033 CB01 CB06 CB08 DA05 DA19 EC04 5K067 AA33 AA34 BB04 CC08 DD17 EE00 EE04 EE24 HH17 HH22

Claims (36)

[Claims] Claims: 1. A mobile network enabling communication between a plurality of terminals, comprising: receiving an IP packet addressed to a moved terminal;
The terminal generates an encapsulated IP packet for transferring a packet to a destination of the terminal, and transfers the encapsulated IP packet to a destination of the terminal via a path set according to the QoS class. First I normally connected
A P node and the encapsulation I received from the first IP node
A second IP node to which the terminal is connected at a destination where the IP packet is extracted from the P packet and transmitted to the terminal; A mobile network for notifying and notifying QoS information for setting a QoS class of the encapsulated IP packet. 2. The mobile network according to claim 1, wherein the terminal notifies the destination and the QoS information to the first IP node using a location registration control packet. 3. The mobile network according to claim 1, wherein the first IP node stores the destination information and the QoS information in a table format. 4. The method according to claim 3, wherein the first IP node sets a predetermined expiration date for the destination information and the QoS information, and rewrites the information when the terminal moves and at predetermined time intervals. Mobile network. 5. The first IP node, when there are a plurality of forwarding destinations of the IP packet, generates the encapsulated IP packets by the number of forwarding destinations and transmits the encapsulated IP packets to each forwarding destination. The mobile network according to any one of claims 4 to 4. 6. A mobile network for enabling communication between a plurality of terminals, comprising, upon receiving a first IP packet addressed to a moved first terminal, an IP indicating a destination of the first IP packet. A second IP packet whose address is rewritten to the destination IP address of the first terminal is generated, and the second IP packet is transferred to the first terminal via a path set according to the QoS class.
An IP node to which the first terminal normally transfers, to the destination of the terminal, and wherein the first terminal is the IP node or the first I
A mobile network for notifying a destination to at least one of the second terminals that have transmitted the P packet, and for notifying QoS information for setting a QoS class of the second IP packet. 7. The first terminal notifies a destination of the first terminal and the QoS information to the IP node and the second terminal by using a control packet for location registration. The described mobile network. 8. The mobile network according to claim 6, wherein the IP node and the second terminal store destination information of the first terminal and the QoS information in a table format. 9. The IP node and the second terminal set a predetermined expiration date in a destination of the first terminal and the QoS information, and when the first terminal moves, and 9. The mobile network according to claim 8, wherein the mobile network is rewritten every time. 10. When there are a plurality of transfer destinations of the first IP packet, the IP node generates the second IP packets by the number of the transfer destinations and transmits the same to each of the transfer destinations. The mobile network according to any one of claims 6 to 9. 11. The second terminal comprises: a destination of the first terminal from the first terminal;
When notified of the S information, the first I
A second IP packet in which the IP address indicating the transmission destination of the P packet is rewritten to the IP address of the destination of the first terminal is generated, and the path in which the second IP packet is set according to the QoS class is generated. The mobile network according to claim 6, wherein the transmission is directly performed to a destination of the first terminal via a mobile terminal. 12. The second terminal, when there are a plurality of paths, duplicates the second IP packet by the number of paths and transmits the duplicated IP packet to the first terminal via each path. Item 12. The mobile network according to Item 11. 13. A method for transferring an IP packet for enabling communication between a plurality of terminals via a mobile network, comprising the steps of: receiving an IP packet addressed to a moved terminal; Generates an encapsulated IP packet for transferring the IP packet to a destination of the terminal, and the terminal moves the encapsulated IP packet through a path set according to the QoS class. The IP packet is forwarded to the second IP node connected earlier, the IP packet destined for the moved terminal is extracted and transmitted from the second IP node to the terminal, and the moved terminal sends the IP packet to the first IP node. An IP packet transfer method for notifying a destination of a terminal and QoS information for setting a QoS class of the encapsulated IP packet. 14. The information on the destination of the terminal and the Qo
14. The method according to claim 13, wherein the S information is notified from the terminal to the first IP node using a control packet for location registration.
How to transfer P packets. 15. The information on the destination of the terminal and the Qo
14. The IP packet transfer method according to claim 13, wherein the S information is stored in a table format by the first IP node. 16. The information on the destination of the terminal and the Qo
The IP packet transfer method according to claim 15, wherein a predetermined expiration date is set in the S information, and the terminal is rewritten when the terminal moves and every predetermined time. 17. When there are a plurality of transfer destinations of the IP packet, the first IP node generates the encapsulated IP packets by the number of the transfer destinations and transmits the encapsulated IP packets to each of the transfer destinations. 17. The method for transferring an IP packet according to any one of items 16. 18. A method for transferring an IP packet for enabling communication between a plurality of terminals via a mobile network, the method comprising: receiving a first IP packet addressed to a first terminal that has moved. In the IP node to which the first terminal normally connects, the IP address indicating the destination of the first IP packet is rewritten to the IP address of the destination of the first terminal and the second I
Generating a P packet, transferring the second IP packet to a destination of the first terminal via a path set according to the QoS class, and transmitting the IP node or the first IP packet. A QoS for notifying at least one of the second terminals of a destination of the first terminal from the first terminal and setting a QoS class of the second IP packet
An IP packet transfer method for notifying S information. 19. The first terminal notifies the IP node and the second terminal of the information on the destination of the first terminal and the QoS information using a control packet for location registration. The method of transferring the IP packet described in the above. 20. The IP packet transfer method according to claim 18, wherein the destination information and the QoS information of the first terminal are stored in a table format by the IP node and the second terminal. 21. The method according to claim 18, wherein a predetermined expiration date is set in the information on the destination of the first terminal and the QoS information, and the information is rewritten when the first terminal moves and every predetermined time. IP packet transfer method. 22. When there are a plurality of transfer destinations of the IP packet, the second IP packet is generated by the number of the transfer destinations by the IP node and transmitted to each transfer destination.
9. The method for transferring an IP packet according to item 8. 23. When the first terminal moves, rewrites an IP address indicating a destination of a first IP packet transmitted to the first terminal by the second terminal to an IP address of a destination. To generate a second IP packet,
19. The method of transferring an IP packet according to claim 18, wherein the IP packet is directly transmitted to the destination of the first terminal via a path set according to the QoS class. 24. When there are a plurality of said paths, said second
24. The IP packet transfer method according to claim 23, wherein the IP packets are copied by the number of paths and transmitted from the second terminal to the first terminal via each path. 25. A location management server device, which is an IP node to which a mobile terminal is normally connected, which is connected to a mobile network and transfers IP packets to enable communication between a plurality of terminals. When an IP packet addressed to the moved terminal is received, the IP
A processing device for generating an encapsulated IP packet for transferring a packet to a destination of the terminal, and transferring the encapsulated IP packet to a destination of the terminal via a path set according to the QoS class; A storage device for storing information on a destination of the terminal and QoS information for setting a QoS class of the encapsulated IP packet, which is notified from the moved terminal; 26. The location management server device according to claim 25, wherein the storage device stores information on a destination of the terminal and the QoS information in a table format. 27. The destination information of the terminal and the Qo
27. The location management server device according to claim 26, wherein a predetermined expiration date is set in the S information, and the information is rewritten when the terminal moves and every predetermined time. 28. The processing apparatus according to claim 25, wherein, when there are a plurality of transfer destinations of the IP packet, the processing device generates the encapsulated IP packets by the number of the transfer destinations and transmits the same to each of the transfer destinations. A location management server device according to any one of the preceding claims. 29. A location management server device, which is an IP node to which a mobile terminal is normally connected, which is connected to a mobile network and transfers IP packets to enable communication between a plurality of terminals. Upon receiving a first IP packet addressed to the terminal that has moved, a second IP address in which the IP address indicating the destination of the first IP packet is rewritten to the IP address of the destination of the terminal
A P packet is generated, and the second IP packet is
A processing device for transferring to the destination of the terminal via a path set according to the S class, and setting information of the destination of the terminal and a QoS class of the second IP packet, which are notified from the terminal. Storage device for storing QoS information for use in the location management server device. 30. The location management server device according to claim 29, wherein the storage device stores information on a destination of the terminal and the QoS information in a table format. 31. The destination information of the terminal and the Qo
31. The location management server device according to claim 30, wherein a predetermined expiration date is set in the S information, and the location information is rewritten when the terminal moves and every predetermined time. 32. The processing device, when there are a plurality of transfer destinations of the IP packet, the second
The location management server device according to any one of claims 29 to 31, wherein the number of IP packets is generated for the number of destinations and transmitted to each destination. 33. A fixed terminal device connected to a mobile network for transmitting and receiving IP packets so as to enable communication with a mobile terminal, wherein when the terminal moves, it is addressed to the terminal. The first sent
Rewrites the IP address indicating the destination of the IP packet to the destination IP address to generate a second IP packet, and transfers the second IP packet to the terminal via a path set in accordance with the QoS class. A processing device for directly transmitting to the destination, and a storage device for storing information on the destination of the terminal and QoS information for setting a QoS class of the second IP packet, which is notified from the terminal. Fixed terminal device. 34. The fixed terminal device according to claim 33, wherein the storage device stores information on a destination of the terminal and the QoS information in a table format. 35. The destination information of the terminal and the Qo
35. The fixed terminal device according to claim 34, wherein a predetermined expiration date is set in the S information, and the terminal is rewritten when the terminal moves and every predetermined time. 36. When there are a plurality of paths, the processing device duplicates the second IP packet by the number of the paths, and copies the second IP packet through each path.
The fixed terminal device according to any one of claims 33 to 35, which transmits the fixed terminal device to a terminal.